Microspectrophotometric examination of the retinal photoreceptors of the budgerigar (shell
parakeet), Melopsittacus undulatus (Psittaciformes) and the zebra finch, Taeniopygia guttata …

Avian plumage has long been used to test theories of sexual selection, with humans
assessing the colors. However, many birds see in the ultraviolet (< 400 nm), to which …

The visual ecology of six closely related species of Puerto Rican anoline lizards was
investigated and they were found to occupy four distinct habitat types in terms of light …

Where colour is used in communication absolute judgement of signalling spectra is
important, and failures of colour constancy may limit performance. Stomatopod crustaceans …

While absorption spectra of bird cone visual pigments have been well studied, physiological
study of bird cone cells has been less advanced owing to their small sizes. We measured …

The visual receptors in the retina of the passeriform bird Serinus canaria (the canary) have
been examined microspectrophotometrically. The rods have a maximum absorbance close …

There are two approaches to the study of adaptive hypotheses of behavior: a historical
approach focused on determining the origins of behaviors, and a non-historical approach …